| 摘要 |
PROBLEM TO BE SOLVED: To drive an electromagnetic valve with a zero-lash adjuster smoothly, even when a hydraulic pressure decreases due to breakdown of pressure supplying system. SOLUTION: This electromagnetic valve is provided with an armature 56, interlocked with a valve body 12 and electromagnets 58, 62 applying an electromagnetic force to the armature 56. The electromagnetic valve is also provided with a zero-lash adjuster 40 interposed between the valve body 12 and the armature 56, and elongates in accordance with change in clearance due to the supply of hydraulic oil. The electromagnetic valve is further provided with energizing means 11, 65 for energizing the electromagnets 58, 62. The energizing means 11, 65 have a normal mode to perform the prescribed energizing when opening and closing the valve body 12, and a compensation mode to energize the electromagnets 58, 62 in a different way, so as to enable opening and closing of the valve body 12 when the hydraulic pressure decreases abnormally.
|
